.NET Framework Version 3.0 3.0 SP1
The .NET Framework 3 is included as part of the Windows Vista operating system; you can install it or uninstall it using Windows Features Control Panel. This redistributable package is for Windows XP and Windows Server 2003.
The latest version (3.5) contains many new features building incrementally upon .NET Framework 2.0 and 3.0, and includes .NET Framework 2.0 service pack 1 and .NET Framework 3.0 service pack 1.
Microsoft .NET Framework 3.0 Service Pack 1 provides cumulative roll-up updates for customer reported issues found after the release of Microsoft .NET Framework 3.0. In addition, this release provides security improvements, and prerequisite feature support for Microsoft .NET Framework 3.5.